Descendants of a World War I hero are searching for his long-lost daughter, more than a century after John Carroll earned the Victoria Cross on the Western Front.

Known to everyone as Jack, Mr Carroll earned Australia's highest military honour for heroism over 96 hours on the frontline during the Battle of Messines Ridge — a bloody battle in Belgium made famous by the film Beneath Hill 60.

The railway guard and timber cutter married his sweetheart Mary Brown in Perth after the war and most historians, including the Australian War Memorial's official account, state the couple had no children.

But Mr Carroll's great-nephew Ray Green said the couple had had a daughter named June, and he had found new photographic evidence to prove her existence.

New photographs show long-lost daughter

Mr Green, a 73-year-old retired school teacher from Newcastle, was in WA's Goldfields this week, where Mr Carroll grew up and worked on the woodlines supplying timber for mines during the gold rush era.

Research at the Eastern Goldfields Historical Society uncovered photographs of Mr Carroll standing with family, as well as a picture of his daughter June, dated 1934.

"We found a pictorial record of the woodlines and in there we found photos of my mother Dorothy and her sister Sheila," Mr Green said.

"That was an incredible find, but we also found a photograph of June in 1934 at the Kurrawang Primary School — that was an unbelievable find."

Family believes wife died of tuberculosis

The family has struggled to find official records such as birth and death certificates, but has newspaper clippings that show Mr Carroll's wife Mary died of tuberculosis in December 1935 after being sent to the Wooroloo sanatorium.

The facility was used by the State Government to house a small number of leprosy patients and for the treatment of tuberculosis, with many patients being ex-miners from the Goldfields.

Many of them ended up in the nearby Wooroloo Cemetery in unmarked graves.

Mr Green's partner Sharon Gibbins has been helping research the family history, and said it was possible Mr Carroll could not look after his daughter while working on the woodlines.

Ms Gibbins said newspaper death notices stated Mary was the "loving wife of J Carroll VC" and "fond mother of June".

"We think Mary died when June was nine," she said.

"We assume June was taken by one of Mary's sisters after she died — that's possibly where the connection deteriorates."

Dutch connection in search for lost relative

Mr Green's research indicated June would turn 92 on May 13.

The family believes she married a Dutchman named Danny Boskaljon, and newspaper clippings suggest she gave birth to a son named John Heindricks at Perth's King Edward Memorial Hospital in 1944.

"We have put a bit of time in [researching] and believe she did marry a Dutch man and it could be that she eventually went to Holland, but we don't know," he said.

"We believe she also had a son who was born in 1944. Things get a bit murky from there.

"We're going to keep trying — one of my brothers made a phone call to Holland to track down the Boskaljon connection, and when he mentioned the name Carroll the phone was promptly put down on the other end, so that just added to the mystery associated with June Carroll."

The last known mention of June was in a newspaper report that noted she attended a family funeral with her father in April 1947, but there was no mention of her husband or son.

The family said since then, it was as if she had vanished like a ghost.